iOS音频播放 (五)：AudioQueue 转

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OSStatus AudioQueueNewOutput (const AudioStreamBasicDescription * inFormat,
AudioQueueOutputCallback inCallbackProc,
void * inUserData,
CFRunLoopRef inCallbackRunLoop,
CFStringRef inCallbackRunLoopMode,
UInt32 inFlags,
AudioQueueRef * outAQ);

OSStatus AudioQueueNewOutputWithDispatchQueue(AudioQueueRef * outAQ,
const AudioStreamBasicDescription * inFormat,
UInt32 inFlags,
dispatch_queue_t inCallbackDispatchQueue,
AudioQueueOutputCallbackBlock inCallbackBlock);

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OSStatus AudioQueueAllocateBuffer(AudioQueueRef inAQ,
UInt32 inBufferByteSize,
AudioQueueBufferRef * outBuffer);

OSStatus AudioQueueAllocateBufferWithPacketDescriptions(AudioQueueRef inAQ,
UInt32 inBufferByteSize,
UInt32 inNumberPacketDescriptions,
AudioQueueBufferRef * outBuffer);

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OSStatus AudioQueueFreeBuffer(AudioQueueRef inAQ,AudioQueueBufferRef inBuffer);

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OSStatus AudioQueueEnqueueBuffer(AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer,
UInt32 inNumPacketDescs,
const AudioStreamPacketDescription * inPacketDescs);

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OSStatus AudioQueueStart(AudioQueueRef inAQ,const AudioTimeStamp * inStartTime);

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OSStatus AudioQueuePrime(AudioQueueRef inAQ,
UInt32 inNumberOfFramesToPrepare,
UInt32 * outNumberOfFramesPrepared);

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OSStatus AudioQueuePause(AudioQueueRef inAQ);

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OSStatus AudioQueueStop(AudioQueueRef inAQ, Boolean inImmediate);

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OSStatus
AudioQueueFlush(AudioQueueRef inAQ);

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OSStatus AudioQueueReset(AudioQueueRef inAQ);

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OSStatus AudioQueueGetCurrentTime(AudioQueueRef inAQ,
AudioQueueTimelineRef inTimeline,
AudioTimeStamp * outTimeStamp,
Boolean * outTimelineDiscontinuity);

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AudioTimeStamp time = ...; //AudioQueueGetCurrentTime方法获取
NSTimeInterval playedTime = time.mSampleTime / _format.mSampleRate;

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AudioTimeStamp time = ...; //AudioQueueGetCurrentTime方法获取
NSTimeInterval playedTime = time.mSampleTime / _format.mSampleRate; //seek时的播放时间

NSTimeInterval seekTime = ...; //需要seek到哪个时间
NSTimeInterval timingOffset = seekTime - playedTime;

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NSTimeInterval progress = timingOffset + playedTime;

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AudioQueueDispose(AudioQueueRef inAQ,  Boolean inImmediate);

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//参数相关方法
AudioQueueGetParameter
AudioQueueSetParameter

//属性相关方法
AudioQueueGetPropertySize
AudioQueueGetProperty
AudioQueueSetProperty

//监听属性变化相关方法
AudioQueueAddPropertyListener
AudioQueueRemovePropertyListener

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//属性列表
enum { // typedef UInt32 AudioQueuePropertyID
kAudioQueueProperty_IsRunning               = 'aqrn',       // value is UInt32

kAudioQueueDeviceProperty_SampleRate        = 'aqsr',       // value is Float64
kAudioQueueDeviceProperty_NumberChannels    = 'aqdc',       // value is UInt32
kAudioQueueProperty_CurrentDevice           = 'aqcd',       // value is CFStringRef

kAudioQueueProperty_MagicCookie             = 'aqmc',       // value is void*
kAudioQueueProperty_MaximumOutputPacketSize = 'xops',       // value is UInt32
kAudioQueueProperty_StreamDescription       = 'aqft',       // value is AudioStreamBasicDescription

kAudioQueueProperty_ChannelLayout           = 'aqcl',       // value is AudioChannelLayout
kAudioQueueProperty_EnableLevelMetering     = 'aqme',       // value is UInt32
kAudioQueueProperty_CurrentLevelMeter       = 'aqmv',       // value is array of AudioQueueLevelMeterState, 1 per channel
kAudioQueueProperty_CurrentLevelMeterDB     = 'aqmd',       // value is array of AudioQueueLevelMeterState, 1 per channel

kAudioQueueProperty_DecodeBufferSizeFrames  = 'dcbf',       // value is UInt32
kAudioQueueProperty_ConverterError          = 'qcve',       // value is UInt32

kAudioQueueProperty_EnableTimePitch         = 'q_tp',       // value is UInt32, 0/1kAudioQueueProperty_TimePitchAlgorithm      = 'qtpa',       // value is UInt32. See values below.
kAudioQueueProperty_TimePitchBypass         = 'qtpb',       // value is UInt32, 1=bypassed
};

//参数列表
enum    // typedef UInt32 AudioQueueParameterID;
{
kAudioQueueParam_Volume         = 1,
kAudioQueueParam_PlayRate       = 2,
kAudioQueueParam_Pitch          = 3,
kAudioQueueParam_VolumeRampTime = 4,
kAudioQueueParam_Pan            = 13
};